Model parameters varied in sensitivity analysis with resulting effect on the incremental cost per HIV infection averted (for 1995–8 and in 2004 $US) of using POC tests (70% sensitive POC test costing $2 per test) in the SIDA2 project in Cotonou
| Model parameter for cost model | Value used for main projection | Values used in sensitivity analysis | Cost per HIV infection averted for 70% sensitive test (% divergence from main projection) | |||
|---|---|---|---|---|---|---|
| Minimum | Maximum | Main projection | Minimum | Maximum | ||
| Cost of test | $2 | $1 | $4 | $151 | $81 (−46.3%) | $292 (+46.9%) |
| Extra time needed to undertake POC test | 0.3 hours | 0.25 hours | 0.33 hours | $151 | 148 (−1.7%) | 153 (+1.5%) |
| Salary cost of clinic staff using POC tests | $0.88 per hour | $0.5 per hour | $1.5 per hour | $151 | 144 (−5.0%) | 164 (+8.8%) |
| Cost of Ng/Ct treatment | $1.21 | $0.5 | $1.21 | $151 | 156 (+3.3%) | NA |
| Time needed to undertake training | 3 hours | 2 hours | 4 hours | $151 | 151 (−0.0%) | 152 (+0.1%) |
| Number of tests used in training session | 50 | 25 | 75 | $151 | 151 (−0.2%) | 152 (+0.3%) |
| Number of clinic staff trained over 4 years | 2 | 2 | 4 | $151 | NA | 152 (+0.1%) |
| Discount rate | 3% | 1% | 6% | $151 | 151 (−0.0%) | 152 (+0.1%) |
| All parameters varied, except cost of test, to maximise or minimise divergence | $151 | 142 (−6.5%) | 172 (+13.9%) | |||